Sioux City weather in April: Sioux City, Iowa: normal highs, lows, rain and records for April
Sioux City in April has a normal high of 61°F and a normal low of 37°F, a daily mean of 49°F, rising from 56°F on the 1st to 66°F by the 30th. Measurable precipitation falls on 10 days in a normal April, 3.15 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 16°C and low of 3°C, 80 mm of precipitation and 6 cm of snow in April.
- NOAA stationSioux City Airport
- Station IDUSW00014943
- Location42.39°N 96.38°W
- Elevation1,095 ft (334 m)
- From the center7 miles
- Population86,875
- Jan 30° 10°
- Feb 34° 15°
- Mar 48° 26°
- Apr 61° 37°
- May 72° 49°
- Jun 82° 59°
- Jul 85° 63°
- Aug 83° 61°
- Sep 77° 51°
- Oct 63° 38°
- Nov 47° 25°
- Dec 33° 15°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Sioux City in April?
The normal high is 61°F and the normal low 37°F, for a daily mean of 48.9°F. April is 12.2°F warmer than March and 11.6°F cooler than May. April is the 7th warmest month of the year in Sioux City and the 5th wettest. Across the month the normal high rises 10°F, from 56°F on April 1 to 66°F on April 30. From one year to the next April's mean temperature typically moves about 3.5°F either way (NOAA's standard deviation), so roughly two Aprils in three average between 45°F and 52°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 37%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| April 1 | 56°F | 32°F | 30% | 16% |
| April 8 | 59°F | 34°F | 32% | 18% |
| April 15 | 61°F | 36°F | 34% | 20% |
| April 22 | 63°F | 39°F | 35% | 21% |
| April 30 | 66°F | 42°F | 37% | 22% |
Every day of April: normal high, low and chance of precipitation (warmest afternoon April 30, coldest night April 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| April 1 | 56°F | 32°F | 30% | 16% | 12 h 40 min |
| April 2 | 56°F | 32°F | 30% | 16% | 12 h 40 min |
| April 3 | 57°F | 32°F | 30% | 16% | 12 h 50 min |
| April 4 | 57°F | 33°F | 31% | 17% | 12 h 50 min |
| April 5 | 57°F | 33°F | 31% | 17% | 12 h 50 min |
| April 6 | 58°F | 33°F | 31% | 17% | 12 h 50 min |
| April 7 | 58°F | 34°F | 32% | 18% | 13 h |
| April 8 | 59°F | 34°F | 32% | 18% | 13 h |
| April 9 | 59°F | 34°F | 32% | 18% | 13 h |
| April 10 | 59°F | 35°F | 33% | 19% | 13 h 10 min |
| April 11 | 60°F | 35°F | 33% | 19% | 13 h 10 min |
| April 12 | 60°F | 35°F | 33% | 19% | 13 h 10 min |
| April 13 | 60°F | 36°F | 33% | 20% | 13 h 10 min |
| April 14 | 61°F | 36°F | 34% | 20% | 13 h 20 min |
| April 15 | 61°F | 36°F | 34% | 20% | 13 h 20 min |
| April 16 | 61°F | 37°F | 34% | 20% | 13 h 20 min |
| April 17 | 62°F | 37°F | 34% | 21% | 13 h 20 min |
| April 18 | 62°F | 38°F | 35% | 21% | 13 h 30 min |
| April 19 | 62°F | 38°F | 35% | 21% | 13 h 30 min |
| April 20 | 63°F | 38°F | 35% | 21% | 13 h 30 min |
| April 21 | 63°F | 39°F | 35% | 21% | 13 h 40 min |
| April 22 | 63°F | 39°F | 35% | 21% | 13 h 40 min |
| April 23 | 64°F | 39°F | 36% | 21% | 13 h 40 min |
| April 24 | 64°F | 40°F | 36% | 22% | 13 h 40 min |
| April 25 | 64°F | 40°F | 36% | 22% | 13 h 50 min |
| April 26 | 65°F | 40°F | 36% | 22% | 13 h 50 min |
| April 27 | 65°F | 41°F | 36% | 22% | 13 h 50 min |
| April 28 | 66°F | 41°F | 37% | 22% | 13 h 50 min |
| April 29 | 66°F | 42°F | 37% | 22% | 14 h |
| April 30 | 66°F | 42°F | 37% | 22% | 14 h |
- Normal high
- 61°FApril average
- Normal low
- 37°FApril average
- Precipitation
- 3.15 inmonth total
- Days with precipitation
- 100.01 inch or more
- Snowfall
- 2.3 inmonth total
- Nights at 32°F or colder
- 10
- Daylight
- 12 h 40 min to 14 hApril 1 to April 30
- Days at 70°F or more
- 9
- Days at 80°F or more
- 3
- Sunshine
- 71%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014943; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Sioux City in April?
On a given April day the chance of 0.01 inch or more is 34% on average, highest around April 30 (37%). In all, 3.15 in falls on 10 days of a normal April, 1 of them with an inch or more.
In a normal April in Sioux City, 10 nights fall to freezing, 1 days stay below freezing all day and snowfall averages 2.3 inches.
Snow falls on 1 day in a normal April, and an inch or more covers the ground on 1 day.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014943.
How humid and windy is Sioux City in April?
At 3 p.m. the normal temperature is 65°F with 43% relative humidity and a dew point of 41°F; at 6 a.m. it is 45°F with 80% humidity. The wind averages 11.7 mph, most often from the north-northwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 45°F | 39°F | 80% | 9.3 mph | 52% |
| 9 a.m. | 54°F | 42°F | 63% | 12.5 mph | 60% |
| noon | 61°F | 42°F | 48% | 14.8 mph | 52% |
| 3 p.m. | 65°F | 41°F | 43% | 14.9 mph | 56% |
| 6 p.m. | 63°F | 41°F | 45% | 13.5 mph | 51% |
| 9 p.m. | 55°F | 42°F | 61% | 10.1 mph | 59% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014943. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for April in Sioux City?
The warmest April temperature on Sioux City's official record (since 1889) is 98°F, on April 28, 1910; the coldest is −2°F, on April 3, 1975. The wettest April brought 6.73 in (1984); the snowiest, 22.9 inches (1913).
The April mean against the 1991-2020 normal of 48.9°F: 2021 49.6°F (+0.7), 2022 46.6°F (−2.3), 2023 49.7°F (+0.8), 2024 51.5°F (+2.6), 2025 50.1°F (+1.2), 2026 51.1°F (+2.3). 5 of 6 ran warmer than normal.
| April | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 49.6°F | +0.7°F | 1.46 in |
| 2022 | 46.6°F | −2.3°F | 1.44 in |
| 2023 | 49.7°F | +0.8°F | 1.25 in |
| 2024 | 51.5°F | +2.6°F | 4.28 in |
| 2025 | 50.1°F | +1.2°F | 1.72 in |
| 2026 | 51.1°F | +2.3°F | 3.46 in |
Source: records: ACIS, NWS threaded record SUXthr; recent months: ACIS, station USW00014943. Records and recent months use complete months only.
How does April in Sioux City compare across Iowa?
Across the 132 places PlainClimate covers in Iowa, April normal highs run from 54°F in Northwood to 64°F in Glenwood; Sioux City's is 61°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.